266481 has 12 divisors (see below), whose sum is σ = 398580. Its totient is φ = 171360.

The previous prime is 266479. The next prime is 266489. The reversal of 266481 is 184662.

It can be written as a sum of positive squares in 2 ways, for example, as 147456 + 119025 = 384^2 + 345^2 .

It is not a de Polignac number, because 266481 - 2¹ = 266479 is a prime.

It is a super-2 number, since 2×266481² = 142024246722, which contains 22 as substring.

266481 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (266489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250 + ... + 771.

It is an arithmetic number, because the mean of its divisors is an integer number (33215).

2²⁶⁶⁴⁸¹ is an apocalyptic number.

It is an amenable number.

266481 is a deficient number, since it is larger than the sum of its proper divisors (132099).

266481 is a wasteful number, since it uses less digits than its factorization.

266481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1053 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 266481 is about 516.2179772151. The cubic root of 266481 is about 64.3510172391.

It can be divided in two parts, 266 and 481, that added together give a palindrome (747).

The spelling of 266481 in words is "two hundred sixty-six thousand, four hundred eighty-one".